Which is more cost-effective, Grok 4.5 or GPT-4.1?

Based on 1M input + 1M output tokens, Grok 4.5 costs $8.00/month versus GPT-4.1 at $10.00/month. The cheaper option depends on your token volume and prompt-to-completion ratio. Use the interactive calculator on this page to enter your exact usage.

How accurate is this cost comparison?

List prices come from each provider's own pricing page and every model page shows when they were last verified. The capability scores are iOPTERA's editorial composites — informed by public benchmarks, not benchmark results themselves; the methodology page explains how they are set.

Which model scores higher on benchmarks?

Grok 4.5 scores 89 in coding and 90 in reasoning benchmarks. GPT-4.1 scores 89 in coding and 90 in reasoning. See the full 5-category breakdown in the Benchmark Comparison section above.

What are the context window sizes of Grok 4.5 and GPT-4.1?

Grok 4.5 supports a 500K-token context window while GPT-4.1 supports 1.0M tokens. A larger context window lets you process more text in a single API call.

Which model is faster for real-time applications?

Grok 4.5 has a speed score of 89/100 and GPT-4.1 scores 88/100 on our latency benchmark. For interactive chatbots and low-latency tasks, the higher speed score is preferable.

Can I calculate costs for my specific token volume?

Yes. Use the interactive cost calculator on this page. Enter your monthly token volume and adjust the prompt-to-completion ratio. You can also use presets for common scenarios like Customer Support Bots (~30M tokens/month) or Document Summarizers (~15M tokens/month).

Cost and performance comparison

Grok 4.5 vs GPT-4.1

Model AxAI

Grok 4.5

Capability score (editorial)90/100

Cost / 1M Tokens: $3.20; 70% in · 30% out mix
Value Index (score÷cost): 28.1; Higher = better value

Speed: 89/100
Context: 500K
Tier: Smart Tier

List price from the xAI pricing page, verified October 12, 2026.

Check the source

How we verify prices

Model BOpenAI

GPT-4.1

Capability score (editorial)90/100

Cost / 1M Tokens: $3.80; 70% in · 30% out mix
Value Index (score÷cost): 23.7; Higher = better value

Speed: 88/100
Context: 1.0M
Tier: Smart Tier

List price from the OpenAI pricing page, verified October 12, 2026.

Check the source

How we verify prices

In-depth analysis

Grok 4.5 vs GPT-4.1: Detailed Comparison

Grok 4.5 is xAI's mid-range-tier language model with a 500K-token context window, excelling at reasoning. GPT-4.1 from OpenAI is a mid-range-tier model supporting 1.0M tokens in context, with standout performance in data extraction.

Grok 4.5 is both the cheaper and the stronger model here — for the same text it costs 16% less than GPT-4.1 and still leads on combined coding and reasoning by 0 points. There is no tradeoff to weigh on this pair: unless you need something specific from GPT-4.1, the cheaper model is simply the better one. Grok 4.5 is priced at $2.00/M input tokens and $6.00/M output tokens. GPT-4.1 costs $2.00/M input and $8.00/M output.

On iOPTERA's editorial scores, Grok 4.5 leads with 89/100 for coding and 90/100 for reasoning, against GPT-4.1's 89/100 and 90/100.

Capability breakdown

Across the five core benchmark categories, here is how Grok 4.5 and GPT-4.1 stack up head to head:

coding

Tie

reasoning

Tie

data extraction

GPT-4.1 leads

creative tasks

Tie

vision/multimodal

GPT-4.1 leads

Best model by task

data extraction: GPT-4.1 wins with 92/100
vision/multimodal: GPT-4.1 wins with 90/100

Estimated monthly cost at scale

For 10M + 2M tokens of text a month (counted the way OpenAI's tokenizer counts), Grok 4.5 runs about $32.00 while GPT-4.1 runs about $36.00 — Grok 4.5 saves roughly $4.00 (11%) every month.

What actually decides it

Grok 4.5 and GPT-4.1 come from different labs, which means different tokenizers, different API shapes, and a second vendor relationship. The same English text does not produce the same token count on both, so a price-per-million comparison understates the difference — measure your own prompts on each before treating the headline rates as the full story.

Grok 4.5 and GPT-4.1 are 15 months apart, which is more than one generation in this market. Benchmark comparisons across that gap flatter the older model: it was measured against the evaluations that existed at the time. Treat GPT-4.1's scores as a floor for what it does well and be sceptical of a close-looking result.

GPT-4.1 carries the larger context window at 1.0M tokens versus 500K for Grok 4.5. The gap is real but not decisive — it matters if your prompts routinely run long, and is irrelevant if they sit where most production prompts sit, well under 100K. Bear in mind that filling a large window is also what makes a request expensive.

Throughput is close enough to ignore — 89/100 versus 88/100. Neither model will feel noticeably quicker in an interactive product, so latency is not a reason to choose between them.

One practical asymmetry: GPT-4.1 offers a batch API at 50% off standard rates, and Grok 4.5 does not. For anything that does not need an answer immediately — nightly enrichment, backfills, evaluation runs — that discount can be worth more than the difference in list price, and it is easy to overlook when comparing headline rates.

Grok 4.5 wins this comparison outright — cheaper and stronger. Choose GPT-4.1 only if it has a specific capability you need; on price and benchmarks it is behind on both.

What you actually pay

The list price is only the start. Prompt caching, batch processing and long prompts change the bill, and each provider sets them differently. Prices per 1M tokens.

Pricing terms beyond the list price, per 1M tokens
Pricing term	Grok 4.5	GPT-4.1
List price (input / output)	$2.00 / $6.00	$2.00 / $8.00
Cached input	$0.3015% of the input price	$0.5025% of the input price
Batch API	Not on the price page	50% off input and output
Long prompts	From 200K tokens: $4.00 / $12.00	No surcharge across the 1.05M window
Input with 80% cache hits	$0.64	$0.80

With 80% of input served from the cache, Grok 4.5 costs 20% less than GPT-4.1 for the same input text, counting each model's tokenizer.The tokenizer factor for Grok 4.5 is our estimate until it is measured.

The last row assumes 80% of input tokens are read from the cache, as in a chat app that re-sends a long system prompt or RAG over the same documents. Cache-write and storage charges are not included.

Checked on October 8, 2026 against the pricing pages of xAI, OpenAI.

Capability scores

iOPTERA editorial scores across 5 categories — informed by public benchmarks, not measured by us

CategoryGrok 4.5GPT-4.1Winner

Coding

Tied

Reasoning

Tied

Extraction

Creative

Tied

Vision

Grok 4.5: 0 wins

GPT-4.1: 2 wins

GPT-4.1 leads overall

Speed Score

89/100vs88/100

GrokGPT-4.1

Context Window

500Kvs1048K

GrokGPT-4.1

What Is a Token?

Models don't read words — they process tokens.

A token is roughly 4 characters of English text (~¾ of a word). Your API bill is priced per million tokens — understanding this directly reduces your costs.

Short phrase

"Hello, world!"

4 tokens

Grok 4.5: $0.80
GPT-4.1: $0.80

Business email

One typical email (~200 words)

~270 tokens

Grok 4.5: $54.00
GPT-4.1: $54.00

Code file

50-line Python script

~400 tokens

Grok 4.5: $80.00
GPT-4.1: $80.00

Prices shown are for 100,000 runs of each workload — one run costs a fraction of a cent on both Grok 4.5 and GPT-4.1, so the number only becomes meaningful at production volume. Input tokens only; add your output volume in the calculator below.

How to check your token usage

response.usage.total_tokens

Every API response includes a usage object. Sum total_tokens across all calls to get your monthly figure, then use the calculator below.

Your Cost Calculator

Enter your actual monthly token usage to see real savings

Quick Presets

Monthly Token Volume

30M tokens

Prompt / Completion Split

Prompt 70%Completion 30%

Cheaper

Grok 4.5

$96.00/mo

$1,152.00/yr

$2.00/M input$6.00/M output

GPT-4.1

$114.00/mo

$1,368.00/yr

$2.00/M input$8.00/M output

Annual Savings

$216.00 saved per year

Grok 4.5 cheaper · $18.00/mo

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